From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [TestDay] Xen-4.5.0 RC1 bug: with
 "xen_platform_pci=0" option,
 the guest with VT-d device fails to boot up and qemu-xen
Date: Wed, 12 Nov 2014 11:23:06 -0500
Message-ID: <20141112162306.GA24513@laptop.dumpdata.com>
References: <9E79D1C9A97CFD4097BCE431828FDD31A4C76C@SHSMSX103.ccr.corp.intel.com>
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To: "Hu, Robert" <robert.hu@intel.com>
Cc: "JBeulich@suse.com" <JBeulich@suse.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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> Basic root-causing log:
> ----------------------
> [root@vt-hsw1 carl]# xl cr xlexample.hvm 
> Parsing config from xlexample.hvm
> libxl: error: libxl_qmp.c:287:qmp_handle_error_response: received an error
> message from QMP server: Unsupported bus. Bus doesn't have property
> 'acpi-pcihp-bsel' set
> libxl: error: libxl_create.c:1385:domcreate_attach_pci: libxl_device_pci_add
> failed: -3

I can reproduce this.

If you use "device_model_version = 'qemu-xen-traditional'" the problem
go aways and you can boot the guest without Xen PCI platform driver.